DG-OHM
UNAOHM Srl Rev. 4.0
27
11.7 LTE
The LTE function will analyze the best coexistence of digital terrestrial signals with the latest
LTE signals which, because of their frequency and power, without proper protection would risk
interfering with the last available MUX DVB-T.
This function will help to calibrate the LTE signal protection filters or to assess any
performance of those used.
To activate the LTE function, press and hold
, select LTE and press
.
The instrument will automatically set the SPAN values and more selective filters to analyze the
best of their coexistence.
The markers will then automatically be positioned on the frequencies of channel 60 and
channel 61, activating continuous calculation in real time, comparing the power of channel 61
to that of channel 60.
ΔLTE communicates the resulting ratio between the two signals in real time:
ΔLTE > 30 critical condition (filter not working properly or absent)
ΔLTE just under 30 (filter working just enough)
ΔLTE < 25 (filter working very well)
11.8 LTE FILTER TEST
Function that allows you to test the actual efficiency of LTE filters and therefore automatically
verify if their response complies with CEI100-7 regulations from December 2012.
Use of the LTE FILTER TEST function requires mandatory use of a noise generator, such as
the NG600 model.
To activate the function, press and hold
, select “LTE Filter”
and press
.
The instrument automatically positions itself in spectrum mode, entering a fixed SPAN value,
displays the level in LINE mode and a determined frequency to allow complete display of the
filter response curve.
3 markers will also be positioned at the following frequencies:
Marker 1 786.00 MHz centre frequency CH60 (reference level)
Marker 2 790.00 MHz end frequency CH 60 (maximum loss 6 dB)
Marker 3 793.00 MHz adjacent LTE channel start frequency (minimum attenuation 30
dB).
